Ross Lyon will remain as coach of Fremantle until at least the end of 2020.
Lyon, who was already signed with the Dockers until the end of 2017, has signed a three-year extension to ensure his tenure at the AFL club lasts for at least nine seasons.
The 49-year-old headed west from St Kilda ahead of the 2012 season and has taken the Dockers to four consecutive finals series.